Phonograph stop



May 26, 1925. '1,539,466

J. BRANDSTETTER PH'oNoGnAPH sToP Filed oct. 27. 1925l Patented May 26,1925i.

'UNITED sit/sir'as Josua BRANDST'ETTER, 'o'r enferme, rrLiNo-s.

Application filed october' 27,1'1923. ser'iarivo. Brigate..

To all whom t may concern.'

Be it known that I, Josnr BRANDSTETTER, citizen lof the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented'certain new and useful Improvements in a -Phonograph Stop ,andl do hereby' declare the `following to be a full, clear, and exactdescription ci the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to a phonograph attachment for use with the classot phonographs in which the reproducer is carried by a tone arm whichswings over the record disk.

Generally speaking, my invention aims to provide an exceedingly simple,easily manipulated and inexpensive stop for this purpose; also one whichcan readilyfbe attached to previously completed or already installedphonographs, which will have the major portions of such a relatively lowheight as to be readily disposed below the turntable and to be largelyconcealed by the turntable; and one which can easily be adjusted so asto hasten or retard the stop action according to the amount of lost playand the extent of bending of various partsof the stop mechanism and ofthe phonograph portions operatively associated with the same.

More particularly, my invention provides a phonograph stop which canreadily be attached to a standard type of phonograph Without requiringany alterations or machine work on the latter, which will have its triparm operated directly by the swinging tone arm of the phonograph withoutrequiring the attaching of any auxiliary parts to this tone arm, whichcan easily be manipulated for setting it according to the effectivelength of the record, and which can readily be adjusted with a highdegree ot accuracy as to the point at which it stops the record.

Furthermore, my invention provides a phonograph stop in which themovement ot' the trip arm when adjusting the latter also tends to movethe latching arm, in which the resulting movement causes the latchingarm to exert a pressure on the brake arm, and in which the adjustmentdemanded'by variations in sizes and shapes of the parts and-the assemblyof the latter is aitord'ed by an adjustable limit 'stop associatedV'either with the lbrake arm or with the latching arm. -Still furtherand" also more detailed objects will appear lfromv thevfollowingspecification 'and from the accompanying' drawings, v"inWhich- I Fig. ll' is a fragmentary plan 'view-of a phonograph, showingthe tone arm and the reproducer as they appear to a person lookingdownward while standing behindthe phonograph, and showing theturntableland a record partly cutaway to disclose the position otthestop embodying lmy invention, this stop being in its inoperativeposition as it appearsduring the playing of the record.

F ig. 2 is an enlarged plan View ofthe same stop, showing this as itappears when,

the latch hasbeen released so as to permit the spring to set thebrakeand stop the turntable.

Fig. 8 is an enlarged and vertical section taken through Fig. 2 alongthe line 3-3 ot that iigure, with portions broken away toshow't'herelative disposition of various parts' when the latch has been releasedand the brake arm is inits operative position.l

Fig. 4 is a similar view taken when the latch"A is set so as to hold thebrakev arm in its v,inoperative position. I

Fig. 5 is a somewhat diagrammatic elevation of parts of the same'embodiment showing the operation ofv the adjustment and the setting ofthe stop according to the length of thel record.

Fig; 6 is a similar view showing another arrangement of the adjustment,namely one in which the adjustable limiting member directly engages thela'tching lever.`

`In accomplishing the lpurposes of my in U vention according to' theillustrated embodiment, I provide as a supporting base a relatively thinhorizontal'plate 1 land a brake arm? secured to this base plate2 by avertical pivot pin Sand moving in a horizontal plane close to the top ofthe base plate. This brake arm has ahandle 4 piojecting beyond thenormally' outward edge of the base plate. 'It also desirabl'y `has meansengaging a portion of the base plate to limit the pivotal movement ofthebrake arm in one direction, such as a downwardlyv turned finger 3 movingin a slot 6` in the lbase plate and engaging one end of the slot whenthe brake arm is moved in that direction by'a tension spring? interposedbetween the brake'arm and afpost 8 fastened to the lbase plate. Thebrake arm also carries a brake 9 of leather or the like disposed forVengaging the interior of the usual downwardly turned flange .10 on theturntable 11 of the phonograph.

Pivoted to the base plate on a horizontal axis, suchY as that affordedby a pin 12, is a bell-crank'lever, comprising a latching arm 13 (whichextends close to the top of the base plate)` and a riser arm 14.Thelatching armhas portions-thereof continuously underhanging the brakearm 2, and to permit of this while havin-g the brake arm close to thetop of the base plate, Iprovide the base plate with a recess formation,such as a slot 15 into which this portion of the latchingl arm depends.Furthermore, this latchf.`

ing arm has an offset in: the same so as to afford` an upper face, 16engaged by the brake Aarmgwhenthe latchxis released and the ,f brake isoperative, and a v,relatively lower upper face 17 engaged by the brakearm when the latch isset so as to hold the brake inoperative, these twoface portions 16 and 17 `being joined by a shoulder 18 which engages anedge poitio1i,19of.tlie brake arm whenvthe latch is set. To effect thesetting of the latch, the handle 4 is manually moved in a directionwhich is counterclockwisein Figs. 1 and 2 so as to slide the brake armiromthe position of Fig. v3 to that of Fig. 4, whereupon the vlatchingarm is swungupwards as shown in Fig. athrough the operationv of a spring20 vwhich continuously tends 5to swing the bell-crank lever in thatdirection. Y v

The riser arm 14 carries an upward exten sion in the form of a trip arm21V which is pivoted to the riser arm through a friction j joint, 22andwhich extends upwardly into the path of the .tone arm 23 of the phono-Ygraph,.so that (with therstop Amounted as in Fig. 1) the movement of the.tone'arm during the playing lof the record will cause this tone arm toengage the trip arm, thereby moving the bell-crank lever against lthere-g sistance ofthe spring 20 and releasing the llatch so that thespring 7 can setthe brake. In setting the stop for `effective use withany particular record 24, the trip arm is iirstV swung far, out of itsoperative positionafter 'the manner shown in dotted lines .in Fig. 5,

this being done while the brake is iii its op- 'any parts and nospringing of any parts,

but in practice these last named occurrences may make a difference ofseveral revolutions rjustedVV positionv of Vthe limit finger. quently,by turning the screw 29 so as to adfjust the position of this iinger, Ican vary .j ,139'

inthe record as to the actual time and pointv of the stopping. Thisisvtrue partly because there may be lost motion in the mounting of thetone arm and of the repioducer, partly'becauseof the diliculty ofaccurately'adjusting any friction joint, partly because of the springingof various parts of the stop,

and also because of possible variationsin thel exact lsize and assemblyof the parts of my stop.

component ToV compensate iorsuch variations in the effective point ofstopping,lI provide ad-v A justable means for limiting the swinging Ymovement of the latching arm during` the above described setting ofthestop, Vand dev sirably provide lthis adjustment so ythat it operatesthrough the brakek arm andy also,V

serves tohold the latter continuously in a position close to thelatchingarm. v- For this purpose, I preferably mount upon the base plate 1 an4adjustable member 26 made of resilient metal and presenting a fingerA27 which over-hangs the brake,v arm 2. V.This member 26 has one endrigidly fastened to Athebase plate by a -screw 28 while a screw.

2 9 extends into thebase platethrough a medial portion of this adjustingmember so that the limit finger 27 Vcan be bentdown-.

wards more or lessaccording kto the tightening orloosening of thisVAscrew 29. -v

In operating my stop, starting with the trip arm in the position showniii dotted lines in Fig. 5, the tone arm .is so `disposed that theAneedle ofthe reproducei' engages the portion of the record groove atwhich it yis desired to stop the needle. WVhen the trip arm 21 is thenswuiigagainsttlie toneV arm as shown in full linesinFig. 5, the frictionofthe' joint 22 will tend to cause this move` ment of the trip arm tomove the entire bellcrank or detent lever bodily. In doing4 so, thelatching arm 13 the lever raises'the brake arm 2 until this brake arm isstopped by engagement with theflimit finger 27.

When thus stopped, the brake arm in turn acts as a` stop for thelatching varm so that los.,

the vlatter can not be swuiigupward farther, 4 i

' and the bell-crank lever then remains stopped as a whole while thetrip arm 21 may move von further so as to takeup any llost motion invthe tone, arm and reproducer iiiountings. As soon as the fingerwhichtrips the trip arm V21 against the tone arm is released, the

resiliency of the brake arm and of the limit i finger, both actingin'opposition to the lifting tendency ot' the spring 20, return the bellcrank leverjto the position shown in Y Fig?) with the'trip arm. At thesame time, the tone arm and reproducer will snap backto their formerposi-tions, The trip arm 21 then extends at an angle to the latching armwhich anglehas been determined by the ad- CoIlSei Y the effective angle-between the trip'finger and the latching member so as to compensate forthe characteristics which would otherwise make the stop act either toosoon or too late.

In practice I have found that even with the parts made of relativelythin stool; and with only a moderate care employed in assembling theparts, the adjustment provided in this manner is such that I canread-ily cause my appliance tostop the needle Within a small fraction ofa Single rotation of the record from the 'point on the groove at whichthe reproducer needle was placed when setting the stop.

To keep the latching arm of the detent lever close to the edge of theturntable so as to permit my stop tobe used in phonographs where thespace behind the turntable '2 is quite limited, I desirably curve thisarm concentrically with the turntable after the manner shown in Fig. 2and correspond ingly curve the slot entered by the free end portion ofthis arm so'as to guidethat portion. I also desirably form the ShOUldIportion 19 on the brake arm so that this shoulder will be radial of thesaid curvature when the brake arm is latched.

However, I do Lnot wish'to be limited to these or other details'of theconstruction and arrangement here disclosed, it'being obvious that thesame might be modiied in many ways without departing either from thespirit of my invention orffrom the appended claims. For example, instead'of having the limit member (here shownv as the linger 27) act on thelatching arm through the intermediary of the'fbrake'arnnI can disposethis limit membervso that it will engage the latching arm directly,after the manner of Fig. 6. y However, I preferably employ the general'arrangement of Figs. l. to 4 so that the limit finger will aid'mholding the brake arm close to the latching arm,

-- thereby permitting me to usea brake arm made of thin and somewhatresilient material While permitting ample clearancebetween the top ofthe brake arm and the limit finger vfor avoiding friction while thebra-lie is being released. t

In either case it will be obvious that by using a flat base plate and abrake arm swinging closely over it, I can secure an assembly of such alow height as to find room for it under the turntable of a standardphonograph, while the use of a detent member moving in a vertical planepermits the trip arm to extend directly into thepath of the tone arm,such a detent member being cheaply manufactured in the shapev of abell-crank lever having offset face and shoulder portions as above'described. (Also,

since thetop of the base plate l will engage the latching armof'thefdetent lever toliuit the movement'of the latter inf-.itsreleasing direction, I secure rmy said"advantagesfby adjusting theeffective distance betweenfthe two limit stops `for 'thelatching'orletent member.

, I claim as my inventiontl. A phonograph stop comprising a` supportingmember, `a springLurged braken lfm and a latching lever pivoted to thesupporting member on relatively transverse "ares and so arrangedthatthebrake arm llimits the movement I.of the latching .lever'jn onedirection, and atri-p arm' connected 'tothe latching lever by a frictionjoint andso positi'oned that itfwill move the latching" lever inthe-said direction when the tripa-rmis moved againstthe tone Tarm o'fthe 'phono graph duringlthe setting of the lstop 2. In a phonographstop, a brake army pivoted for.` movement inv a horizontal plane, and adetent member pivoted for move-nent in a vertical plane, the detentmember h w' ing an arm disposed in the path ofthe tone arm of thephonograph and havin'gfjanother arm disposed 4for '-latcliing'the brakearm, the said other arm being curved concentric withv the pivotingaXisof the Vbrake arm.

3. In `a phonograph stop, a brafkearm pivotedfor movement in ahorizontalxplane, and a detent member pivotedfor movement in a verticalplane, the detent membenhaving one arm disposed in the patli'of the tonearm of the phonograph and having anothc" arm disposedfor latching thebrake arm, the said other rarm being curved concentric.vith'the'pivoting axis ofthe braker arm, the portion 'of the fbr'alrearm which-` is vengaged by the said other arm of the detentmember'being.- radial of the said pivoting axis.

4. In a phonograph stop, a vbrake arm pivoted for movement inahorizontal plane, and adetent member pivoted-'for Amovement in avertical plane, the det-ent member having an arm disposed in the path ofthe tonearin of the phonographl and having another arm disposed/forlatching the brake'arm, and a supportto which the brake'ar'm anddetentmemberare pivoted, the support having Va base provided with alslot inwhich yaipar't of the 'said other armo'fthe detentim'emb'er moves. l w iv g 5. 'In a phonograph stop, a brake arm pivoted for movementinayhorizontal plane,` and a detent member .pivoted for movement in avertical plane, the detent member having an `arm disposedin `the, path'ofthe "tone arm ofthe vphonograph and yhavingyanother arm disposed forlatching the brake 'armT y and a support-to-which the brake'iarm anddetent member .are pivoted',l the:- support having a base provided withaslotin which? av part of thesai'd-` otherarm `of Atliedetent membermoves and havinga. portionadapted to engage the said other armtolimitthev movementof `the detent member in' one di-r rection` i vjusting of the trip 6. A phonograph stop comprising a substantiallyhorizontal base, a detent arm pivoted theretoion a `horizontal axis andhaving a portion adapted to rest upon the top of the base and acontinuation portion of lesserl height, a brake arm pivoted to the baseon a vertical` axis and having its lower face` substantially in theplane of the upper edge of the first named detent arm portion when thisportion is resting on the top of the base, the juncture of the said twoarm portions affording a shoulder for engaging the brake arm'wh'en thedetent arm is raised off its said restingdisposition, a spring urging jthe brake arm toward the pivot of thede- 4 portion of the base below thebrake arm.

8. VA stop fora phonograph, comprising a brake arm pivoted for movementin a horizontal plane, a spring continuously tending to move the brakearm to its brak-4 ing position, a detent lever pivoted. for

movement in a vertical plane and adapted to holdthe bra-ke arm- `in aninoperative position, and a trip arm pivoted to thedetent lever by afriction joint and disposed` in the vpath of the tone arin ofthephonograph;

the brakel armbeing arranged to swing over an arm of the detent leverwhen the brake is set, so that the engagement of the detent lever withthe brake arm will prevent the detent lever from4 moving in one,direction about its pivotal Vmounting during the adarm about thefriction joint.

k9..A stop for'a phonograph, comprising.

a brake armvpivoted for movement in a horizontal plane, a springcontinuously tending to move vthe brake arm to its braking position, adetent lever pivoted for mOVementina vertical.: plane and having one armadapted to holdthe brake arm in .an-,inoperative position, and a triparm pivoted to the detent lever by .a'friction joint and disposed in theApath` of the tone armof the phonograph, .the brake arm being disposedfor stopping the pivotal movement of the other arm of the ydetent levertowards the tone arm. f

10. A stop for a phonograph, comprising a brake arm pivoted for movementin a horizontal plane, a spring lcontinuously tending to move the brakearm to its braking position, a detent lever pivoted for movement in avertical plane and adapted tog` hold the brake arm in an inoperativekposition,V anda trip arm pivoted to the detent lever .by a

rictionjoint and disposed in the path of the tone arm of the phonograph,the detenty lever `having a portion underhanging the brake arm when thebrake is latched in its inoperative position and having another portionunderhanging the brake arm when the brake is set. j i l l e 11.'A stopfor a phonograph, comprising a brake arm pivoted for movement ina hori'-zontal plane, a spring continuouslytending to move the brakearm to its;braking position, a detent lever pivoted 'for movement in 'a verticalplane and adapted to hold the brake arm in an inoperative position, and

a friction joint and disposed in the path of the tone arm of thephonograph, the brake arm being disposed for stopping thepivotalmovement of the detent lever in one direc-V tion, a spring continuouslytending to move 4 the detent arm in the `said direction, and a stop-for.limiting the lifting ofthe brake arm by the detent lever. H

l2. A stop for a phonograph, comprising` u a brake arm pivoted forymovement in a hori-vv zontalplane, a spring-continuously tending Y tomove the4 brake arm to its braking position, a latching lever -p'ivotedfor movement Y in a vertical plane and adapted yto hold the brake arm inan inoperative position, and a trip arm pivotedto the latching Vleverby'a friction joint and' disposed in the path of the tone arm of thephonograph,A the brake arm being disposedV for stopping `the pivotalmovement of the latching lever in one direction, and a pair of stops forlimiting the movement of the detentfarin in respectively'oppositedirections.g

l13. vA .stop for a phonograph, comprising a brake armrpivoted formovement in a horizontal plane, a spring 'continuously tending to movethe brake-arm to its braki to hold the brake armin aninoperativeposition, and a trip arm pivoted to the latching lever by a.friction joint and disposed in the path of the tone arm of thephonograph, the-brake arm being disposed for stopping the pivotalmovement of theflatching lever in' onedirection, a pair voi'rstops forlimitingV the movementofthe latchingv` Y ing position, Va latchingleverpivotedfor movement in a vertical plane and adapted lever inrespectively opposite directions,

and means for adjusting the efectivedistance between thestops. I

PLA stop for a phonograph, comprisingVV a brake arm pivoted forkmovement in a horizontal plane, a spring continuously; tending to movethe brake arm to itsy braking position, a latching .lever ,pivoted formovement in a vertical plane and adapted.

to hold the brake arm inv an inoperative position, and a' trip arm.ivotedto the'latch-VV Y ing lever by a friction joint and disposed in 0the path. of the Ltone arm of the phonograph,

a trip arm pivoted to the detent llever by S0 -i the latching leverhaving a portion underhanging the brake arm When the brake is latched inits inoperative position and having another portion nnderhanging thebrake arm when the brake is set, the juncture ol the said two detent armportions forming a shoulder for engaging the brake arm.

l5. A phonograph stop Comprising as one member a spring-actuated pivotedbrake arm, and as another member a lever having a latchng armunderhanging the brake arm; and a trip arm mounted on the lever anddisposed in the path of the tone arm of the phonograph, the trip armbeing adjustable in position with respect to the latching arm and beingadapted to be moved againstV the said tone arm to adjust the stop, thearrangement being such that the said move-v ment of the trip arm againstthe tone arm also moves the said lever in one direction; and adjustablemeans associated with one of the lirst named two members for limitingthe movement of the detent lever in the said direction.

Signed at Chicago, Illinois, Oct. 20th, 1923.

Josnr BRANDsTnT'rER.

